The game loop

A run has four beats. Each beat is a sink for one coin or the other, and the economy is designed so that the sinks always exceed the sources.

• Clear the floor. Isometric rooms, procedurally stocked. Bats, slimes and skulls. Each kill mints $YIELD and drops materials.
• Crack the chests. Chests hold the materials the forge wants. Some sit behind locked doors, some behind rooms you have to earn.
• Forge up. Materials push a weapon toward +10. Enhancement can fail, and a failed attempt still charges you.
• Raid the vault. The endgame door. You buy a ticket to open it, clear the room for the payout, and the ticket is destroyed on use.